Add Django AppConfig

anymail/__init__.py

@@ -1,2 +1,5 @@
 # Expose package version at root of package
 from ._version import __version__, VERSION  # NOQA: F401
+
+
+default_app_config = 'anymail.apps.AnymailBaseConfig'

anymail/apps.py

@@ -0,0 +1,9 @@
+from django.apps import AppConfig
+
+
+class AnymailBaseConfig(AppConfig):
+    name = 'anymail'
+    verbose_name = "Anymail"
+
+    def ready(self):
+        pass